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Reset Primary Key in MySQL
To reset primary key, at first use TRUNCATE table, then use ALTER TABLE. Let us first create a table −
mysql> create table DemoTable1929 ( UserId int NOT NULL AUTO_INCREMENT, PRIMARY KEY(UserId) ); Query OK, 0 rows affected (0.00 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1929 values(); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1929 values(); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1929 values(); Query OK, 1 row affected (0.00 sec)
Display all records from the table using select statement −
mysql> select * from DemoTable1929;
This will produce the following output −
+--------+ | UserId | +--------+ | 1 | | 2 | | 3 | +--------+ 3 rows in set (0.00 sec)
Here is the query to reset primary key −
mysql> truncate table DemoTable1929; Query OK, 0 rows affected (0.00 sec) mysql> alter table DemoTable1929 auto_increment=1; Query OK, 0 rows affected (0.00 sec) Records: 0 Duplicates: 0 Warnings: 0
Now you can insert record, it will reset the primary key value from 1 −
mysql> insert into DemoTable1929 values(); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1929 values(); Query OK, 1 row affected (0.00 sec)
Display all records from table using select statement −
mysql> select * from DemoTable1929;
This will produce the following output −
+--------+ | UserId | +--------+ | 1 | | 2 | +--------+ 2 rows in set (0.00 sec)
Updated on: 30-Dec-2019
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